黄土高原植被建造的潜势分析

通过野外综合考察，以２０万年以来为时间尺度，在黄土高原不同纬度和生物气候带内选择武功、洛川和安塞三个典型黄土剖面，以土壤微形态方法为主，结合理化、矿物和孢粉分析，依据黄土剖面中古土壤发生学特征、孢粉组合及理化、矿物特性，探讨黄土高原在地质历史时期森林植被的时空分布特征及其发育、发展和退化的演替规律，分析黄土剖面的物质组成、结构特征、孔（空）隙分布等要素，探讨黄土剖面的水文地质特性。结果表明，黄土区具有森林植被发育的地质水文条件，曾多次出现过茂密的森林景观和草原景观，森林植被的发育与黄土层的厚度无关。黄土高原植被建造应以现有次生林区为中心，向四周渗入扩散，逐步恢复森林植被。

Analysis of Potential Vegetation Construction in the Loess Plateau

The development, degeneration and evolution laws and distribution features in time and space of forest vegetation in the Loess Plateau in geological history is studied through comprehensive field investigation and taking 200 thousand years as time unit and selecting three typical loess sections respectively in Wugong, Luochuan and Anse that are located in different latitude and biological climate zones, mainly by using micro soil configuration method in combination with analysis of chemical,mineral and spore according to the characteristics of ancient soil, spore and their physical, chemical and mineral properties in the sections. Besides, material composition, structure features, pore distribution and other factors are analyzed, and the hydro-geological characteristics of the loess sections are studied. The result shows that there are hydro-geological conditions for forest development in loess regions, and there had been dense forest and grassland landscape in the area which has no relations with loess depth.Vegetation construction in loess plateau should take the secondary forest as center to extend all around to recover vegetation step by step.